JPH0445504A - A superconducting energy storage coil - Google Patents

Abstract

PURPOSE:To manufacture a superconducting energy storage coil that occupies small areas for both magnetic leakage field and installation, that makes production easy, that reduces production cost, and that enhances the reliability of the storage by laying arc-like solenoid coils at the ends of the linear end part of the coil to form the winding portions of a race-track-like superconducting energy storage. CONSTITUTION:A superconducting energy storage coil consists of 2 linear solenoid coils laid in parallel and arc-like solenoid coils laid at the ends of two linear solenoid coils to bridge the linear coils to complete a storage loop. The conductor is wound round a spool 3 to constitute a winding portion 1. Further, based on a result of examining the ease of maintenance and a design of the stress of an axial compression force, the coil is split into a plurality of portions, and a spool at a split part is made to have a junction structure of flange 2. With this flange 2, the axial compression force that acts on a winding part is independent of each split part to not only suppress that an excessive axial compression force is generated at the center of the winding part, but also makes it easy to assemble and disassemble the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a winding configuration technique for a superconducting energy storage coil.

(Conventional Technique v#) In general, superconducting energy storage coils are generally classified into two types. One of them is called a poloidal type, in which a conductor is wound around a large-diameter winding frame 2 to form a winding portion 1, as shown in FIG. The other type is called a toroidal type, in which a large number of toroidal magnetic field coils 4 are arranged on a central circle 5, as shown in FIG. Here, since the boroidal type has a large hoop force proportional to the radius R, a structure supported by underground rock is generally proposed, which is expensive in terms of cost. In addition, since the magnetic circuit is not closed, the leakage magnetic field is large, and countermeasures against it are a serious problem, and the inner part of the coil (the circular area from the center to the inner diameter of the coil) is affected by the magnetic field, so it becomes a dead space in terms of application. , requires a large installation area.

On the other hand, the toroidal type has a closed magnetic circuit, so the leakage magnetic field is small, but it still requires a large installation area and has a structure in which many coils are arranged circumferentially, so the manufacturing cost is lower than that of a linear solenoid with the same magnetic energy. Much more expensive than coils.

(Problems to be Solved by the Invention) As described above, both the conventional boloidal type and toroidal type superconducting energy storage coils have various problems in terms of installation area, manufacturing cost, and leakage magnetic field.

An object of the present invention is to provide a superconducting energy storage coil that is improved over conventional types in terms of installation area, manufacturing cost, leakage magnetic field, and manufacturability.

[Structure of the invention]

(Means for Solving Problem 11) In order to achieve the above object, the present invention arranges an arcuate solenoid coil at the end of a linear solenoid coil to form a racetrack-shaped winding portion. be.

(Function) In this configuration, first, since the magnetic circuit is closed, the leakage magnetic field is very small, and the radial magnetic field component at the linear solenoid coil winding is small, so that the axial compressive force is very small compared to

On the other hand, linear solenoid coils, which store most of the energy, are much easier to fabricate than traditional boloidal or toroidal types. Therefore, the reliability is high and the cost is low. In addition, since the linear solenoid coils can be installed adjacent to each other, there is no circular dead space like in conventional types, and the required installation area is reduced.

(Example) The present invention will be described below with reference to an example shown in the drawings.

FIG. 1 shows a cross-sectional view of a coil according to the invention. This coil has two linear solenoid coils arranged in parallel, upper and lower on the paper, and an arc-shaped solenoid coil arranged at the end thereof. The conductor is wound around a winding frame 3 to constitute a winding portion 1. Furthermore, based on the results of studies on ease of maintenance and stress design of axial compressive force, the coil is divided into multiple parts, and the winding frames of the divided parts are joined by flanges 2. This flange 2 allows the axial compressive force acting on the winding portion to be independent for each divided portion, suppressing generation of excessive axial compressive force at the center of one winding portion, and facilitating assembly and disassembly.

In this case, compared to conventional voloidal and toroidal type superconducting energy storage coils, the coil according to this embodiment has the following advantages: 16 Since the magnetic circuit is closed, leakage magnetic flux is small like the toroidal type.

Most of the coils can be constructed from linear solenoid coils, which can be adequately handled using conventional superconducting coil manufacturing technology. Therefore, even though it is a coil that stores a huge amount of energy, it is fully possible to manufacture it by extending the current technology, and therefore it has the advantages of easy manufacturing, high reliability, and low cost. Conventionally, as the stored energy increases, the coil diameter of the voloidal type increases.

In the toroidal type, the number of toroidal coils increases, and therefore the concentric circles 5 shown in FIG. 3 in which each coil is arranged increases. This naturally leads to an increase in electromagnetic force and an increase in the required installation area, but in the coil according to this embodiment, it is sufficient to increase the length of the straight section of the linear solenoid coil in response to the increase in stored energy. There are basically no problems.

Generally, the magnetic circuit of a straight solenoid coil is not closed, so the radial magnetic field component increases at the ends, which increases the axial compressive force proportional to the straight length, which causes buckling of the winding. Therefore, the stress design conditions become strict. However, according to this embodiment, since the magnetic circuit is closed,
It has the advantage that the axial compressive force is very small, so there is basically no restriction on the axial length from the standpoint of stress design.

Since two linear solenoid coils can be placed adjacent to each other, there is no circular dead space like in the conventional system, and the required installation area is reduced.

〔Effect of the invention〕

The present invention is a superconducting coil with a closed magnetic circuit mainly consisting of a linear solenoid coil, so compared to conventional coils,
It is possible to provide a superconducting energy storage coil that has a small leakage magnetic field and a required installation area, is easy to manufacture, and has high reliability at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a superconducting energy storage coil according to an embodiment of the present invention, and FIGS. 2 and 3 are views showing conventional storage coils, respectively. 1...Winding part 2...Flange 3...Reeling frame Agent Patent attorney Noriyuki Chika Diagram Diagram Diagram Diagram

Claims (2)

[Claims] (1) A superconducting energy storage coil characterized in that an arc-shaped superconducting coil is connected to an end of a linear superconducting coil to form a racetrack-shaped winding portion. (2) The superconducting energy storage coil according to claim (1), wherein the winding portion is divided into a plurality of parts, and the winding frames of the divided parts are joined by flanges.